<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>加加减减</title>
</head>

<body>
  <div id="app">
    <button @click="btnRandom">走一走</button>
    <ul>
      <li v-for="(item, index) in dataList" :key="index" @click="delBtn(item.id)">
        <span>{{item.id}}</span>
        <button>{{item.content}}</button>
      </li>
    </ul>
  </div>
  <script src="../js/vue.js"></script>
  <script>
    const app = new Vue({
      el: "#app",
      data: {
        dataList: [],
        randomVal: "",
      },
      methods: {
        btnRandom() {
          this.dataList.push({ id: Math.floor(Math.random() * 20), content: "删除" });
        },
        delBtn(id) {
          this.dataList = this.dataList.filter((item) => item.id !== id);
        }
      },
    });
  </script>
</body>

</html>